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Related-Party Transactions (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | $ 3,111 | $ 4,122
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | 1,696 | 1,901
Virginia Electric and Power Company | Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 34 | $ 33 | 109 | 104
Dominion Energy Gas Holdings, LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | 550 | 535
Dominion Energy Gas Holdings, LLC | Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 10 | $ 13 | $ 27 | $ 33

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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